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For the pair of equations λ x + 3y = – 7, 2x – 6y = 14 to have infinitely manysolutions, find the value of λ

Question

For the pair of equations λ x + 3y = – 7, 2x – 6y = 14 to have infinitely manysolutions, find the value of λ

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Solution

Para que el sistema de ecuaciones tenga infinitas soluciones, las dos ecuaciones deben ser proporcionales. Esto significa que los coeficientes de xx, yy y los términos constantes deben ser proporcionales entre sí.

Dadas las ecuaciones:

λx+3y=7 \lambda x + 3y = -7 2x6y=14 2x - 6y = 14

Primero, escribimos las ecuaciones en la forma estándar ax+by=cax + by = c:

  1. λx+3y=7 \lambda x + 3y = -7
  2. 2x6y=14 2x - 6y = 14

Para que las ecuaciones sean proporcionales, debe cumplirse:

λ2=36=714 \frac{\lambda}{2} = \frac{3}{-6} = \frac{-7}{14}

Calculamos cada fracción:

36=12 \frac{3}{-6} = -\frac{1}{2} 714=12 \frac{-7}{14} = -\frac{1}{2}

Entonces, igualamos la primera fracción a las otras dos:

λ2=12 \frac{\lambda}{2} = -\frac{1}{2}

Para encontrar λ\lambda, multiplicamos ambos lados de la ecuación por 2:

λ=1 \lambda = -1

Por lo tanto, el valor de λ\lambda es 1-1.

This problem has been solved

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